2010-1-28 Reply to a question from a patient who has an anterior protrusion of the upper teeth and misalignment of the teeth The common types of misalignment of the front teeth are labial/lingual misalignment, labial/lingual tilt, twisting, crowding, oversized teeth, and undersized teeth. These conditions not only affect the patient’s bite and pronunciation, but can also impair their appearance to varying degrees. For adolescent patients with mild malocclusion (such as mild maxillary protrusion, mandibular protrusion and misalignment of individual teeth), orthodontic treatment can be used to correct them. Adult orthodontics is relatively difficult, will be prone to relapse, and the course of treatment will be longer, requiring regular follow-up visits and long-term insistence on wearing retainers. If the various factors do not do, the effectiveness of the treatment will be greatly reduced! If individual anterior teeth are misaligned, twisted or poorly formed and not suitable for orthodontic treatment, local reshaping restoration such as crown restoration can be carried out alone with reliable and rapid results. However, if the overall occlusal relationship is poor, orthodontic treatment should be done in the long run. For more serious, orthodontic methods are not suitable for correction and older malocclusion, surgical correction through orthognathic surgery is required.